US6028687A - Arrangement for recovering a clock from a modulated optical input signal - Google Patents

Arrangement for recovering a clock from a modulated optical input signal Download PDF

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Publication number
US6028687A
US6028687A US08/894,456 US89445697A US6028687A US 6028687 A US6028687 A US 6028687A US 89445697 A US89445697 A US 89445697A US 6028687 A US6028687 A US 6028687A
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optical
amplifier
transmission channel
wavelength
arrangement
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English (en)
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Cornelius Cremer
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means

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  • Modulated optical input signal clocked by this clock on an optical input carrier wavelength are disclosed, for example, in D. M. Patrick, R. J. Manning: 20 Gbit/s all-optical clock recovering using semiconductor nonlinearity, Electr. Lett. Vol. 30 (1994), pages 151 to 152; A. D. Ellis, K. Smith, D. M. Patrick: Alloptical clock recovery at bit rates up to 40 Gbit/s, Electr. Lett. Vol. 29 (1993), pages 1323 to 1324 or P. E. Barnsley, E. J. Wickes, E. G. Wickens, D. M.
  • An advantage of an arrangement having an optical amplifier in the resonator as compared with multisection DFB lasers is that the nonlinear element is more effectively separated from the residual resonator with its amplifying medium, and can therefore be specifically influenced.
  • the invention whose generic concept specified in the preamble is disclosed in Electr. Lett. Vol. 30 (1994), pages 151 to 152, or else Electr. Lett. Vol. 30 (1994), pages 787 to 788, has the advantage that the laser arrangement can be integrated in a module and that it is rendered possible to recover the clock from the modulated input signal in optical networks with high data rates of 10 Gb/s and more.
  • the arrangement according to the invention which can be designated as an optical clock, corresponds to a mode-locked laser which has an optical resonator with a wavelength-selective optical transmission channel section and at least one optical amplifier at each end of this channel section, the position of the wavelength-selective optical transmission channel section in the resonator being essential to the invention.
  • the optical transmission channel section can advantageously be realized by a bidirectional optical wavelength demultiplexer which acts as a demultiplexer when operated in one direction and acts as a multiplexer when operated in the opposite direction.
  • the arrangement according to the invention can advantageously be used to regenerate the optical input signal in an optical repeater.
  • FIG. 1 shows a first exemplary embodiment of an arrangement according to the invention
  • FIG. 2 shows a second exemplary embodiment of an arrangement according to the invention
  • FIG. 3 shows a third exemplary embodiment of an arrangement according to the invention.
  • the laser arrangement according to the invention recovers the clock T from a modulated optical input signal S o clocked by this clock T on an input carrier wavelength ⁇ 2 , and has an optical resonator 1 composed of a bidirectional optical transmission channel 3 of predetermined optical length L and extending between two resonantor mirrors 21 and 42.
  • the transmission channel 3 has, between the two resonator mirrors 21 and 42, at least two nonlinear optical amplifiers, for example the two amplifiers 2, 4 according to FIG. 1 and, between these amplifiers 2, 4, a wavelength-selective transmission channel section 31.
  • the two amplifiers 2, 4 are arranged sequentially in a transmission direction r of the transmission channel 3 pointing from one resonator mirror, for example the resonator mirror 21, to the other resonator mirror, to the resonator mirror 42 in the case of the example.
  • the transmission channel section 31 connects the two amplifiers 2, 4 optically and serves to transmit an optical signal on a predetermined optical carrier wavelength between these two amplifiers 2, 4, for example the signal S 1 ' on the predetermined carrier wavelength ⁇ 1 in FIG. 1.
  • the input signal S o on the input carrier wavelength ⁇ 2 is launched into the transmission channel 3 by the resonator mirror 21.
  • the other resonator mirror 42 serves to couple out an optical signal S 1 on the predetermined carrier wavelength which originates from the second and last amplifier 4 in the adopted transmission direction r.
  • the resonator 1 forms a mode-locked laser if the first amplifier 2 operates in the nonlinear region with respect to the launched input signal S o .
  • the light power, for example, of the input signal S o is selected to be so high that the first amplifier 2 operates in the nonlinear region, that is to say the optical signal power is higher than the saturation power of the first amplifier 2.
  • a gain then occurs in the resonator 1 which is modulated for all optical wavelengths with the signal rate of the input signal S o , and the longitudinal laser modes of the laser arrangement are coupled to one another, with the result that pulses with the clock rate of the input signal S o occur.
  • the pulse width of the mode-locked laser is a function of the modulation of the input signal S o , of the bit sequence and of the bandwidth of the wavelength-selective transmission channel section 31.
  • the optical signal S 1 originating from the last amplifier 42 and coupled out by the other resonator mirror 42 has pulses I which occur inherently periodically in a clock cycle t of the clock T and define the covered clock T.
  • the optical length L of the transmission channel 3 of the resonator 1 can be adapted, for example, by trimming the temperature of an optical amplifier 2 and/or 4.
  • the transmission channel 3 has an additional wavelength-selective transmission channel section 32 which is arranged between the first amplifier 2 and the other resonator mirror 42 and connects the first amplifier 2 optically directly to the other resonator mirror 42.
  • This additional transmission channel section 32 is designed in such a way that the other resonator mirror 42 is fed an optical signal S o ' on the intput carrier wavelength, which signal originates from the first amplifier 2 ⁇ 2 , can be coupled out of the other resonator mirror 42 and is inherently clocked by the clock T and is modulated in accordance with the input signal S o such that it corresponds to the launch signal S o .
  • the arrangement could also be set up, for example, such that the transmission channel section 31 connected to the last amplifier 4 transmits only the input carrier wavelength ⁇ 2 , and the additional transmission channel section 32 connected to the other resonator mirror 42 transmits only the carrier wavelength ⁇ 1 .
  • the resonator mirror 42 it would be possible to couple out of the resonator mirror 42, on the one hand, an optical signal S 2 , originating from the first amplifier 2 and transmitted via the transmission channel section 31, on the input carrier wavelength ⁇ 2 and, on the other hand, an optical signal S 1 , originating from the first amplifier 2 and transmitted via the additional transmission channel section 32, on the carrier wavelength ⁇ 1 .
  • the signal S 2 on the input carrier wavelength ⁇ 2 would have pulses I which occur inherently periodically in the clock cycle t of the clock T and define the recovered clock T, and the signal S 1 on the carrier wavelength ⁇ 1 would be a signal clocked inherently by the clock T and modulated in accordance with the input signal S o .
  • This signal S 1 would correspond to the signal S o ' or the input signal S o which is converted from the input carrier wavelength ⁇ 2 to the carrier wavelength ⁇ 1 .
  • a wavelength conversion is generally possible in the case where signals on different carrier wavelengths are coupled out of the other resonator mirror 42.
  • a wavelength conversion of the input signal S o can also be performed by modulating in accordance with the input signal S o an optical signal on a carrier wavelength which originates from a last amplifier 4, is coupled out of the resonator mirror 42 and has pulses which occur inherently periodically in the clock cycle of the clock and define the recovered clock T, for example the signal S 1 on the carrier wavelength ⁇ 1 according to FIG. 1.
  • This modulated signal would correspond to the input signal S o which has been converted to this carrier wavelength from the input carrier wavelength ⁇ 2 .
  • the exemplary embodiment according to FIG. 2 differs from the exemplary embodiment according to FIG. 1 essentially in that, between the two resonator mirrors 21 and 42, the transmission channel 3 has, in addition to the first nonlinear optical amplifier 2, two last nonlinear optical amplifiers 4, which are arranged downstream of the first amplifier 2 in the transmission direction r, as well as a wavelength-selective transmission channel section 31 which is arranged between the first amplifier 2 and the two last amplifiers 4, connects the first amplifier 2 optically to each last amplifier 4 and is designed in such a way that one optical signal S 1 , S 2 each is transmitted between the first amplifier 2 and each last amplifier on a predetermined carrier wavelength ⁇ 1 and ⁇ 2 , respectively, assigned to this last amplifier 4, it being the case that the other resonator mirror 42 serves to couple out of the transmission channel 3 on the predetermined carrier wavelength ⁇ 1 and ⁇ 2 , respectively, assigned to this last amplifier 4 the optical signal S 1 , S 2 which originates from each last amplifier 4 and which has pulses I which occur inherently periodically in
  • the carrier wavelength ⁇ 1 is assigned to the upper last amplifier 4, and the input carrier wavelength ⁇ 2 is assigned to the lower last amplifier 4.
  • the recovered clock T can be connected between the carrier wavelengths ⁇ 1 and ⁇ 2 .
  • Two or more such last optical amplifiers 4 generally provide the possibility of switching the carrier wavelength of the recovered clock T on a predetermined raster.
  • Wavelength conversion would also be possible in the case of the example according to FIG. 2 if the output signal S 1 were modulated in accordance with the input signal S o .
  • the exemplary embodiment according to FIG. 3 differs from the exemplary embodiment according to FIG. 2 essentially in that the lower last amplifier 4 is assigned not the input carrier wavelength ⁇ 2 , but a carrier wavelength ⁇ 3 which differs both therefrom and from the carrier wavelength ⁇ 1 assigned to the upper last amplifier 4, and in that, as in the example according to FIG. 1, the transmission channel 3 has an additional wavelength-selective transmission channel section 32 which is arranged between the first amplifier 2 and the other resonator mirror 42 and connects the first amplifier 2 optically directly to the other resonator mirror 42.
  • This additional transmission channel section 32 is designed in such a way that the other resonator mirror 42 is fed on the input carrier wavelength ⁇ 2 an optical signal S o ' which originates from the first amplifier 2, can be coupled out of the other resonator mirror 42 and is inherently clocked by the clock T and is modulated in accordance with the input signal S o such that it corresponds to the launch signal S o .
  • the recovered clock T can be connected between the carrier wavelength ⁇ 1 and ⁇ 3 .
  • wavelength conversion is possible if at least one of the two signals S 1 and S 3 is modulated in accordance with the input signal S o .
  • the nonlinearly operating first optical amplifier 2 In order to be able to drive the clock rate of the clock T recovered from the optical clock as high as possible, the nonlinearly operating first optical amplifier 2 must be illuminated by an intensive undamped optical wave W of a further optical wavelength ⁇ 5 which differs both from the input carrier wavelength ⁇ 2 and from the carrier wavelengths ⁇ 1 , ⁇ 3 which differ from this wavelength ⁇ 2 (see Electr. Lett. Vol. 30 (1994) pages 787 to 788).
  • This further optical wavelength ⁇ 5 either can be launched into the resonator 1 via an existing additional optical transmission channel section 32, and then radiates against the launched input signal S o , or is mixed with the input signal S o and then separated from the launched signal and emitted at another point.
  • the set-up is such that the undamped wave W is launched into the first amplifier 2 by one resonator mirror 21. Coupled out of the first amplifier 2 is an optical wave W' which corresponds to the launched wave W, has the same optical wavelength ⁇ 5 as the latter, is fed to the other resonator mirror 42 via the additional transmission channel section 32 and can be coupled out of this resonator mirror 42.
  • the additional transmission channel section 32 according to FIG. 1 and FIG. 3 is designed for this reason in such a way that, in addition to the input carrier wavelength ⁇ 2 , it also transmits the wavelength ⁇ 5 of the optical wave W.
  • the undamped wave W is launched into the first amplifier 2 by the other resonator mirror 42 via the additional transmission channel section 32.
  • the transmission channel section 31 and/or additional transmission channel section 32 are/is preferably realized by a bidirectional optical wavelength demultiplexer 6, an integratable demultiplexer being preferred.
  • One resonator mirror 21 of the resonator 1 is preferably a partially reflecting amplifier input of the first optical amplifier 2.
  • the other resonator mirror 42 of the resonator 1 is preferably a partially reflecting mirror which comprises a partially reflecting optical amplifier output of one or more last amplifiers 4.
  • One amplifier output 22 of the first optical amplifier 2 and the amplifier input 41 of each last optical amplifier 4, to which the transmission channel section 31 is optically coupled, are preferably optically coated.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
US08/894,456 1995-02-21 1996-02-15 Arrangement for recovering a clock from a modulated optical input signal Expired - Fee Related US6028687A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19505980 1995-02-21
DE19505980 1995-02-21
PCT/DE1996/000241 WO1996026585A1 (fr) 1995-02-21 1996-02-15 Dispositif pour la recuperation d'un signal d'horloge contenu dans un signal optique module d'entree

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EP (1) EP0809902B1 (fr)
JP (1) JPH11500286A (fr)
DE (1) DE59610606D1 (fr)
WO (1) WO1996026585A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005046095A1 (fr) * 2003-11-07 2005-05-19 Perlos Technology Oy Procede et dispositif de traitement de signal tout-optique
US20070189777A1 (en) * 2006-02-14 2007-08-16 Oki Electric Industry Co., Ltd. Optical clock signal extraction device and optical clock signal extraction method
KR100865390B1 (ko) 2006-05-04 2008-10-24 룩스다인 오이 전광 신호 처리 방법 및 디바이스
US20100028016A1 (en) * 2005-05-12 2010-02-04 Perlos Technology Oy Optical Signal Processing Device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548433A (en) * 1992-04-27 1996-08-20 British Telecommunications Public Limited Company Optical clock recovery
US5761228A (en) * 1995-12-15 1998-06-02 Nec Corporation Optical clock regenerator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2662805B2 (ja) * 1988-11-04 1997-10-15 日本電信電話株式会社 光タイミング抽出回路

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548433A (en) * 1992-04-27 1996-08-20 British Telecommunications Public Limited Company Optical clock recovery
US5761228A (en) * 1995-12-15 1998-06-02 Nec Corporation Optical clock regenerator

Non-Patent Citations (18)

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Title
8106 IEEE Journal of Quantum Electronics 28 (1992) Apr., No. 4, New York, US Optical Tank Circuits Used for All Optical Timing Recovery Masahiko Jinno et al., pp. 895 900. *
8106 IEEE Journal of Quantum Electronics 28 (1992) Apr., No. 4, New York, US Optical Tank Circuits Used for All-Optical Timing Recovery--Masahiko Jinno et al., pp. 895-900.
BT Technol J vol. 11 No. 2 Apr. 1993 Nonlinear loop mirror devices and applications K.J. Blow et al. pp. 99 107. *
BT Technol J vol. 11 No. 2 Apr. 1993--Nonlinear loop mirror devices and applications--K.J. Blow et al. pp. 99-107.
Electronics Letters Jan. 20th 1994, vol. 30, No. 2, 20 Gbit/s All Optical Clock Recovery Using Semiconductor Nonlinearity, D.M. Patrick et al., pp. 151 152. *
Electronics Letters Jan. 20th 1994, vol. 30, No. 2, 20 Gbit/s All-Optical Clock Recovery Using Semiconductor Nonlinearity, D.M. Patrick et al., pp. 151-152.
Electronics Letters Jul. 22nd 1993, vol. 29, No. 15, All Optical Clock Recovery At Bit Rates Up To 40 Gbit/s A.D. Ellis et al pp. 1323 1324. *
Electronics Letters Jul. 22nd 1993, vol. 29, No. 15, All Optical Clock Recovery At Bit Rates Up To 40 Gbit/s--A.D. Ellis et al--pp. 1323-1324.
Electronics Letters May 12th 1994, vol. 30, No. 10, "Enhanced Recovery Rates In Semiconductor Laser Amplifiers Using Optical Pumping" --R.J. Manning et al., pp. 787-788.
Electronics Letters May 12th 1994, vol. 30, No. 10, Enhanced Recovery Rates In Semiconductor Laser Amplifiers Using Optical Pumping R.J. Manning et al., pp. 787 788. *
Electronics Letters Sep. 10th 1992 vol. 28, No. 19 All Optical Clock Recovery Using A Mode Locked Laser K. Smith et al., pp. 1814 1816. *
Electronics Letters Sep. 10th 1992 vol. 28, No. 19--All-Optical Clock Recovery Using A Mode-Locked Laser--K. Smith et al., pp. 1814-1816.
IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991 All Optical Clock Recovery from 5 Gb/s RZ Data Using a Self Pulsating 1.56 m Laser Diode P.E. Barnsley et al pp. 942 945. *
IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991--All-Optical Clock Recovery from 5 Gb/s RZ Data Using a Self-Pulsating 1.56 μm Laser Diode--P.E. Barnsley et al--pp. 942-945.
IEEE Photonics Technology Letters, vol. 6, No. 1, Jan. 1994 18 GHz All Optical Frequency Locking and Clock Recovery Using a Self Pulsating Two Section DFB Laser U. Feiste et al pp. 106 108. *
IEEE Photonics Technology Letters, vol. 6, No. 1, Jan. 1994--"18 GHz All-Optical Frequency Locking and Clock Recovery Using a Self-Pulsating Two-Section DFB-Laser" --U. Feiste et al--pp. 106-108.
Patent Abstracts of Japan JP 2126243 vol. 14 No. 352 (P 1085), May 15, 1990 (p.01/01); Japanese Patent pp. 263 269 attached. *
Patent Abstracts of Japan--JP 2126243--vol. 14 No. 352 (P-1085), May 15, 1990 (p.01/01); Japanese Patent pp. 263-269 attached.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005046095A1 (fr) * 2003-11-07 2005-05-19 Perlos Technology Oy Procede et dispositif de traitement de signal tout-optique
US7574143B2 (en) 2003-11-07 2009-08-11 Luxdyne Oy All-optical signal processing method and device
US20100028016A1 (en) * 2005-05-12 2010-02-04 Perlos Technology Oy Optical Signal Processing Device
US20070189777A1 (en) * 2006-02-14 2007-08-16 Oki Electric Industry Co., Ltd. Optical clock signal extraction device and optical clock signal extraction method
US7646985B2 (en) * 2006-02-14 2010-01-12 Oki Electric Industry Co., Ltd. Optical clock signal extraction device and optical clock signal extraction method
KR100865390B1 (ko) 2006-05-04 2008-10-24 룩스다인 오이 전광 신호 처리 방법 및 디바이스

Also Published As

Publication number Publication date
DE59610606D1 (de) 2003-08-21
JPH11500286A (ja) 1999-01-06
WO1996026585A1 (fr) 1996-08-29
EP0809902A1 (fr) 1997-12-03
EP0809902B1 (fr) 2003-07-16

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